linux-kernel - Re: [PATCH 5/8] mm/slub: Factor out some common code.

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Date:	Wed, 16 Mar 2011 13:28:30 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	George Spelvin <linux@...izon.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	herbert@...dor.hengli.com.au, mpm@...enic.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] mm/slub: Factor out some common code.

On Mon, 14 Mar 2011, George Spelvin wrote:

> For sysfs files that map a boolean to a flags bit.

Where's your signed-off-by?

> ---
>  mm/slub.c |   93 ++++++++++++++++++++++++++++--------------------------------
>  1 files changed, 43 insertions(+), 50 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index e15aa7f..856246f 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -3982,38 +3982,61 @@ static ssize_t objects_partial_show(struct kmem_cache *s, char *buf)
>  }
>  SLAB_ATTR_RO(objects_partial);
>  
> +static ssize_t flag_show(struct kmem_cache *s, char *buf, unsigned flag)
> +{
> +	return sprintf(buf, "%d\n", !!(s->flags & flag));
> +}
> +
> +static ssize_t flag_store(struct kmem_cache *s,
> +				const char *buf, size_t length, unsigned flag)
> +{
> +	s->flags &= ~flag;
> +	if (buf[0] == '1')
> +		s->flags |= flag;
> +	return length;
> +}
> +
> +/* Like above, but changes allocation size; so only allowed on empty slab */
> +static ssize_t flag_store_sizechange(struct kmem_cache *s,
> +				const char *buf, size_t length, unsigned flag)
> +{
> +	if (any_slab_objects(s))
> +		return -EBUSY;
> +
> +	flag_store(s, buf, length, flag);
> +	calculate_sizes(s, -1);
> +	return length;
> +}
> +

Nice cleanup.

"flag" should be unsigned long in all of these functions: the constants 
are declared with UL suffixes in slab.h.

After that's fixed,

	Acked-by: David Rientjes <rientjes@...gle.com>
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